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Telecom single photons from a trapped Ba+ ion

Uday Saha, John Hannegan, James Siverns +3 more

Bulletin of the American Physical SocietyJun 3, 20210 citations

Products of reactive collisions between cold Rb atoms and an Ba+ ion

Amir Mohammadi

For my dissertation, I have carried out experiments with a single Ba+ ion which is immersed in a cloud of ultracold neutral Rb atoms. For trapping cold ions and ultracold neutral atoms, we use a linear Paul trap and a far-detuned optical trap, respectively. In the first part of my dissertation, I use the elastic and reactive collisions between the atoms and the ion to minimize the ion excess-micromotion in the Paul trap. I show in my thesis that by minimizing losses in the Rb cloud which are due to the elastic and reactive ion-atom collisions one can suppress excess-micromotion quite well by additional radio-frequency fields that are applied to the Paul trap. In the second part, I studied the evolution of a single BaRb+ molecule while it continuously collides with ultracold Rb atoms. The BaRb+ molecule forms within one ms when we immerse the cold Ba+ ion into a dense gas of Rb. The molecule is initially weakly-bound and can undergo a sequence of elastic, inelastic, reactive, and radiative processes. I investigated these processes by developing methods for discriminating between different ion species, electronic states, and kinetic ion energy ranges.For my dissertation, I have carried out experiments with a single Ba+ ion which is immersed in a cloud of ultracold neutral Rb atoms. For trapping cold ions and ultracold neutral atoms, we use a linear Paul trap and a far-detuned optical trap, respectively. In the first part of my dissertation, I use the elastic and reactive collisions between the atoms and the ion to minimize the ion excess-micromotion in the Paul trap. I show in my thesis that by minimizing losses in the Rb cloud which are due to the elastic and reactive ion-atom collisions one can suppress excess-micromotion quite well by additional radio-frequency fields that are applied to the Paul trap. In the second part, I studied the evolution of a single BaRb+ molecule while it continuously collides with ultracold Rb atoms. The BaRb+ molecule forms within one ms when we immerse the cold Ba+ ion into a dense gas of Rb. The molecule is initially weakly-bound and can undergo a sequence of elastic, inelastic, reactive, and radiative processes. I investigated these processes by developing methods for discriminating between different ion species, electronic states, and kinetic ion energy ranges.

Jan 1, 20200 citations

Light shifts measured in a single trapped Ba+ion

Nivedya Valappol, Klaus Peter Jungmann, Lorenz Willmann +2 more

Oct 11, 20160 citations

Localized visible Ba+ mono-ion oscillator

Werner Neuhauser, M. Hohenstatt, P. E. Toschek +1 more

An individual barium ion, continuously observed by laser fluorescence, has been isolated in a Paul rf quadrupole trap at room temperature. By optical sideband cooling its microscopically measured image has been reduced in thickness to \ensuremath{\sim} 2 \ensuremath{\mu}m in the object plane, the diffraction limit. Estimated ion temperatures reached are ${T}_{i}\ensuremath{\simeq}10 \mathrm{to} <36$ mK. With cooling, the ion could be held indefinitely, without cooling \ensuremath{\sim} 30 s. In the future the technique seems capable of attaining kinetic temperatures \ensuremath{\sim} ${10}^{\ensuremath{-}8}$ K, much lower than realized so far by other means, with corresponding far-reaching implications.An individual barium ion, continuously observed by laser fluorescence, has been isolated in a Paul rf quadrupole trap at room temperature. By optical sideband cooling its microscopically measured image has been reduced in thickness to \ensuremath{\sim} 2 \ensuremath{\mu}m in the object plane, the diffraction limit. Estimated ion temperatures reached are ${T}_{i}\ensuremath{\simeq}10 \mathrm{to} <36$ mK. With cooling, the ion could be held indefinitely, without cooling \ensuremath{\sim} 30 s. In the future the technique seems capable of attaining kinetic temperatures \ensuremath{\sim} ${10}^{\ensuremath{-}8}$ K, much lower than realized so far by other means, with corresponding far-reaching implications.

Physical Review ASep 1, 1980406 citations

Optical trapping of an ion

Ch. Schneider, Martin Enderlein, Thomas M. Huber +1 more

arXiv:1001.2953Nature PhotonicsOct 24, 2010133 citations

rf Spectroscopy with a Single Ba+ Ion

Timo Koerber, M. Schacht, Kristi R. G. Hendrickson +2 more

We have employed the method of shelving to measure Zeeman resonances of a single trapped Ba+ ion. We use optical pumping to place the ion in a selected magnetic sublevel of either the 6S(1/2) ground state or the 5D(3/2) metastable state. The ion is exposed to an rf field, and a probing/shelving mechanism detects whether spin-flip transitions have taken place. We have observed rf transitions with linewidths of 15 Hz, limited by magnetic-field noise. We have also observed the shift in the Zeeman frequency when the ion is illuminated by off-resonant light. A simultaneous measurement of such light shifts in two atomic states of Ba+ will permit a precise determination of the ratio of transition matrix elements.We have employed the method of shelving to measure Zeeman resonances of a single trapped Ba+ ion. We use optical pumping to place the ion in a selected magnetic sublevel of either the 6S(1/2) ground state or the 5D(3/2) metastable state. The ion is exposed to an rf field, and a probing/shelving mechanism detects whether spin-flip transitions have taken place. We have observed rf transitions with linewidths of 15 Hz, limited by magnetic-field noise. We have also observed the shift in the Zeeman frequency when the ion is illuminated by off-resonant light. A simultaneous measurement of such light shifts in two atomic states of Ba+ will permit a precise determination of the ratio of transition matrix elements.

Physical Review LettersMar 26, 200225 citations

A far-off-resonance optical trap for a Ba+ ion

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